You're describing a Portuguese Man-of-War (Physalia physalis), also known as the Blue Bottle. It's not technically a single organism, but a colonial hydrozoan with four specialized types of polyps that are all interconnected and depend on each other for survival.

Here's a breakdown of the four polyp types:

* Pneumatophore: This is the large, gas-filled bladder that keeps the colony afloat and acts as a sail, allowing it to be propelled by the wind.

* Dactylozooids: These are the long, tentacle-like polyps responsible for capturing prey and delivering it to the gastrozooids. They are armed with stinging nematocysts (poisonous barbs) that can paralyze fish and other small creatures.

* Gastrozooids: These polyps are responsible for digesting food captured by the dactylozooids.

* Gonozooids: These polyps are responsible for reproduction. They produce both male and female gametes, and the fertilized eggs develop into new colonies.

The four polyp types work together in a highly coordinated fashion, allowing the Portuguese Man-of-War to survive and thrive in the open ocean. While they appear to be independent, they are all connected by a shared gastrovascular cavity, allowing for nutrient exchange and communication. This makes them a fascinating example of how cooperation can lead to success in the natural world.